SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63c77a7dfe3cd51b1ad3a072d565c167984872945a6cfb1993f813ea75284e75' 
  AND token = 'o3RmQ1Hw+4xqgFaLfo39AGNZp57CbbsVzQw1Qw+/dAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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