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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4df0d6dd07b2495fc5c32630f72338e9ae208950a187e1a7c269ed8ef423fde2' 
  AND token = 'ynQufEv0EcoSm2YzXF/bBlaNbnD2X6j/kh1xfzt+PDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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