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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd6339ef634ee4245ec63093fbeed1781e5654f1f6593a27c5fa59cef0e99f3c' 
  AND token = 'iD2UEMcdiw+zs8EUTZhuVP0+Lj4FvF+97lNzLa/OkZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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