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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '571d22a4318418120f75014c3dbc619706cb532127404b3b03c5630f70db51ed' 
  AND token = 'KqQKGP8F9VJKncDuIxHfcy7RztEYdgopgd5c6NKMqyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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