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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20924c3fa49f122efa21fde8f5556283e385a2972880ce82a1195f6e4131661d' 
  AND token = 'excNtbZ5E3wfLr8u6UEvEvYkJxXBMc5W0XhF7MtCNXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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