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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '616654462a1c3f3998395a7181c9882b2ed6c8004671e55d39f7c4ab856da5e3' 
  AND token = 'jiDPx9anjXBNX6VqK90LAUt3l3X1m5pOL74pvVuBoyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}