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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2779bf649993d35619e6bce40823dac61b617d7b372554522af83d1f460a63d8' 
  AND token = 'iTyUqSPm4oECZATEzdR8Q8NawWoWJW4lEYebPiIRy7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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