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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09403cf5fe2935edd4743f63d7cdf48bdb6608edf65076cfc52fde7f4c5c5360' 
  AND token = 'oykJVUsaFN96eKaE+cFXSigWXtL3N2Yqw7rSW3WU6zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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