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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff4b6f63287d11fc76c11927a7d2c4bb8b447676afeeb87bfd8026a64406cd06' 
  AND token = 'rLrKxWxcIX2r+xM3UkV3zZtjwhErLaojB6jPk0Lf90Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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