SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b410f88aa4eb82eb342b3f55892fd6794766357d617ec193d519ab849f144e0' 
  AND token = 'j8jrICG4MgYG+xpSdGcAk6/yOX7TSKvhfODQl0yIo2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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