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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0384300c1a609f9823679f9087f48b1e025c6d04cbcfc1d95e806aeee2760bfd' 
  AND token = 'mpTxCH6q4YRwQYWRu/3zXmikaQsSC/Yxrhn5rYmw0Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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