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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3f1989526c1ff8f70c8913bdaee738fdb088b5a3f1f24eaa418bfa65f7138ba' 
  AND token = '5DzKdlxb8B5WMym75d1wVMzew0JDBvskrAPxTyuvQzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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