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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b4d4343ebe4562e89fcd03eb5ad3be1a5316b04d4a729da0232cab099d545a1' 
  AND token = '3u5ZI+USSO1yFz7zvDnjizOf6AoLsrZCBR5raVZL3sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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