SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c342735e69347d8d61238349272c7d119da60b98c9385b78883116345b76d5' 
  AND token = '0XC4jGLPES4VHxPGws2jIh6g4XE2akBm3/+ArNNBN3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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