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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ff7b928e2775553fe3e6658bf08cc39a72bd272823ad350dfebe0686eeaa409' 
  AND token = 'KPRh+RfS+2/H4a3k3AhxBr3sA1LZZqm+adV3VqqmY1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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