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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96c7af6e7b28b4640978cf6f98e124b8ee1855bebcd1592f02848f28c4be098f' 
  AND token = '2MqpSlTgj0Po+KmsB77u14pKV+Na/fUQ/1BoebBQQFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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