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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e2150f170cedf53000cb4ef092a9456084b514324e703f307b5f50ef2db79d6' 
  AND token = '/4zoj/MrS2FCs89K3ybJ/vi8piF4WAiqMa9K4wRuSkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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