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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54fd2a3d0647be1f8580702c13adf2dc30b961aca6ba790ac6de541ccd364efb' 
  AND token = 'GmKrB7+x2wr+2fwRxLiXuflDoGp6CfvC9dbrkjU4RJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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