Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87279a7ad50a1775c1713f542b0d34ad494fd7c9cd54ce5f66b9fc5f3a83097b' 
  AND token = 'kn0Fbzftl8oKT0cgJ/3eMgZsnN+amW9ziX+r1crR1Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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