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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '067acf1465a90560a53bec7a17d4a1d7fc302f45853aa363a96e784948be8ec8' 
  AND token = 'crQN+QbH/Y7LOt0I5ArqUGD+wj51ttsDaHkTCA9M8yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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