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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3795ad33ba46ae1a6f6a1bd8b046304bace36adb7930c51b33753dde18f1e094' 
  AND token = 'laiv0359WvgrFsB76O1ZohKlWbrMw2TsEG0aqCyPtiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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