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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '235764fd77973ab7bdd143b259900cf8884612a6ee7f84b8c5925576dbdd54be' 
  AND token = 'c4OM2dise1WEBucz1P479bAGoeEn+TZ8dkuVe6+twRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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