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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6c15fc8ad0c7654b86d6ffdcf3460992ab12506926c902407d177f0391647f8' 
  AND token = '4r6pCwgNYTnEOSfdg9aQgDEkegF9j9FbYsfqzjXPGjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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