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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63bdb9e5af499bb5ccf158e9fad8b6404ca1b3e467e718bb8636d938657ce363' 
  AND token = 'nK262xUor8h2M9ZoE9obLvoio8hhvwBe9NYvrmeoe/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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