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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '686d37bf6ed71e9da9ca55198ed885e1cad8f365614ea2917164a7c18ec8c3d3' 
  AND token = 'A6P3avyiO+/8XqX/douA+ZlAmZqjR0l5KOu5YZxODIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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