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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '412cb547edc67143a7293c19ec0bfc02b34d908e29f986140276ae6381e1e149' 
  AND token = 'K1Ji+Q+bElEFKcSrOmwAPu3o9noGyBIM36DK1EQlk8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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