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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dbfb46cb5de6fe09419ddc1723413bad72ae479d54309dde8db6411c22a468c' 
  AND token = 'vRC9bmlviCl5oGX/lE2p3l80l0KyL2P5WVEYgPmZvOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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