SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '629eb76e924520bc96c80259585c631243cc67b088145b1f46d0b706fcadd8ae' 
  AND token = 'AzFD2ouGhxxOhJIOYvdcKpDmT4zPJBxE1DnqE3XKtLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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