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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a823d231917b3017ded6986f8e10ec679a08f78df71da24d5b742443ed34c8a1' 
  AND token = 'J5u9ONqCQRN3dCXWx9+zEOyQkglt5fckV8kKeb0Hpps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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