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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1083fd00d75d53599fdb534a43f4de6bb83eeb1df6c85aa60bfafec2ae4eed7e' 
  AND token = 'zaagZYRdPQJa552wPgnuB9lERT1LsiDJt/7Yc4PmnXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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