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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1b683e55369cbeba683d187058f3426403b5d305878ec6ccdcfc6e47d22763d' 
  AND token = '0kMGNlplSQXUyqi4OAfF31oILu9vttXO/kN5v/+W27o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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