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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b099faef40d7e9c6b7e80000ce2326ad4b52f8a47dbe043de303dcb04a2d5547' 
  AND token = '2B/ln6+VbYkgKWdPQ97xDh6jllj4xx2rL73fIbr4Ys8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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