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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '343abe5675dceea1ef86173fc8398a3f44fdb11952520395abbaa5c7a74653ad' 
  AND token = '/2wROTbK4utbEnylCYNp9ydLhSzZklqs6MQcuRYNFvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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