SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '218546919572bf1bf5b57658481bacd0335b80ac9626a4fc99f6818ba80052f0' 
  AND token = 'J2Sjn0ikjofKNzk/xk/wg6PRvOHbleLVqhBVYJTurpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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