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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16b4f637022d37022ac85f2bcb499cb1f262468577bf50448c5b50e2d4608f05' 
  AND token = 'dbwBm1mncqHBA1RNfwuSfTt2MZA7urFx5N6Q/LPoi3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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