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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1acdc84a6cdd8d168a3acae1d2de434b1dbb376001592e1874a8b373cdd53f0b' 
  AND token = 'AkKK31ykPWEUCrpATtLyPK0F8vg6HIgx9KvL8y0F/JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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