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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ed27e51f16c592d6ea5dd506df007639d864c5aff2abfdf49d18b8608e50f4b' 
  AND token = 'Bo5n6nDN8p7LbWgxnqxQQCm9Berx2VvkJYwBsbVqqDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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