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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5549b52052d21a07392e491c8a7acd8c2e3f069820831895e5a9a3ce5746dbc1' 
  AND token = 'akdu0jmQlYUn0YY6DpL0dLg7LUwi2ky/FyrycZvQE+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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