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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c81a6eb0448e354daba4cec5f3db10c3c0b83e98fe12e352090fd89bcc0453fd' 
  AND token = 'ZXLi7boNWWEpNiz2ElMIEg8g4cL9vUyX3ycvJCXGIig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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