Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55248a0713c1374a503c04b590c0b06899411a2b6d4e9d4bc21123ecd4bc37e' 
  AND token = 'oWZul30NZT5nvU2dUJiweMdQxddJByYYWF3EsXeB394=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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