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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da49fb53049c9007d732d9adea257a7e46c46e41ef4ecf07025d127accc44d63' 
  AND token = 'l0qAzTYFjvQQxwzNnneFTg7y7ljfiDQ+0PF+YdwQ9BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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