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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ef83eb1ae2aa51b021bfbd4c94e7c2cf34579ae3f11f9c4db528227051a0f2' 
  AND token = 'P4f7sOqQPUgY1r/vHiKoTCM3lkTMkWVtaEXrH6gzSak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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