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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98a0c1a2f8d050853b8ea5e76197d3dc0e8015bde47bb5bdd603a1e0aff7e7c7' 
  AND token = '1jBn9bdm/mCfdB+QwecpFIHFVmWfz4zCAQ9uxV3hsLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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