SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc42734e61810771c1d6043fa8625667c4fb0789273e8f1f9b5028298c52b3da' 
  AND token = 'aI2Jpw9KoNA/CvVsyn15FDOWcXiBG80EkU0BNPrXR7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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