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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bc12dbd06dcc7f7c1f9b6940b77178e3eda19554d2941a7be7a50257b7cbd1c' 
  AND token = 'UaqefXkmNr6Vk4RiKaulIl6jex8+nP3Dy9PMru8f4Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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