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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb68a29a7f9584eb12037f8b60b8b423681cebdaedb9aff6dec646ef951f94d7' 
  AND token = 'u/sm7xq2xxQ0iJNEUpDbq9mxLn+W8GL0IpKpLgHNuig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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