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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9259a9c5002f1e67e336c8a00e4a6e72908357299d6a2f03c2839c0bb7657236' 
  AND token = 'szQFgJWSYlqB93H5q8kAhR36OeusaFe7hVSi0UJbZB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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