Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a0c1a6ce0e14a83a282da56100ef6e589eedddb54639aa9e85a0a0aed51b8a0' 
  AND token = 'KOSef7hUvMx2IA+QNFGXnxvYC5TiZ2nvuM36ZtDPong=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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