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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de1d2bfc6bb604a2863ccc9d1a26b216ebb7f89f9955abaea96504b293e2058e' 
  AND token = 'XIlfTpxQm7dqJQ1xCB/aiS3EL4pMvrfy3cxGxKhiyGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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