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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e090f3a0dc153e2ae625a4bfb798a6cfec0ef2be30ec501ebe237f97c131fe7' 
  AND token = 'okEGUCaVgUqF/dz+gnKVZOKPUrS/Xtq51NHc1HJD2l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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