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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3684deefdd9b033ba9e529ed29f6590fb2977b76f159d86447f52ee1b45b8ce' 
  AND token = 'lBB2RMefAS8JzY8Mxbi8CCIMAkB46eO34V7n91Cz+Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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