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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c3b3b36fab829e1f201b6f039a26d914eb579eb372007bce10091076e6b32dd' 
  AND token = 'bdLfUiSRB3GbTzlpYKs4Av/YOX3hmkn/EWCfIyTGAxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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