SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a2be5987c2cff458478b11693e8ca81b2308f0ff856fa9d0186e720cbdf4790' 
  AND token = 'tKDKr7w5+2jh3JoVOL/7pU7hr0/VOKZYOY5f8/XDeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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