SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e3062820c917f5ec256bde8857070042fc158df2771cdd4fdd2b47835e4eb78' 
  AND token = 'q2YPrweC5LD5piXmM+oPmV6rjm3GBfn6KCI9jkAQ65Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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