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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71529f08bb82fdb5ec802dcf2046fb839bb9129c740d0e63f93b2a82ce989568' 
  AND token = 'SJ74EM14rfzDrVBVCIKIYND/kavx7axAHpOVneatZd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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