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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad282bc9198567e62919ca6cdb0837b185d271548cc07d37d8718c5ef0daef9b' 
  AND token = '7ZfEHDPGHKfy3HXhHaYvFlq2usJlWt4C7C+OaFcC60M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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