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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcff920ea40ad80bcd65a081ff0afa2d2495d73c33d4e74d890a5ff98801a1a2' 
  AND token = 'ojXwnjtbBGjY0Q2REe/Tslfl5/3JenBToO7136g975Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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